TWI302281B - Display unit, display array, display panel and display unit control method - Google Patents

Display unit, display array, display panel and display unit control method

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Publication number
TWI302281B
TWI302281B TW94116739A TW94116739A TWI302281B TW I302281 B TWI302281 B TW I302281B TW 94116739 A TW94116739 A TW 94116739A TW 94116739 A TW94116739 A TW 94116739A TW I302281 B TWI302281 B TW I302281B
Authority
TW
Taiwan
Prior art keywords
voltage
transistor
driving transistor
emitting diode
display unit
Prior art date
Application number
TW94116739A
Other languages
Chinese (zh)
Other versions
TW200641747A (en
Inventor
Shuo Hsiu Hu
Original Assignee
Au Optronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Au Optronics Corp filed Critical Au Optronics Corp
Priority to TW94116739A priority Critical patent/TWI302281B/en
Publication of TW200641747A publication Critical patent/TW200641747A/en
Application granted granted Critical
Publication of TWI302281B publication Critical patent/TWI302281B/en

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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/029Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/04Maintaining the quality of display appearance
    • G09G2320/043Preventing or counteracting the effects of ageing
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/021Power management, e.g. power saving

Description

^ 1302281 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a display unit; in particular, to a display unit having an excitation light display. [Prior Art] Fig. 1 is a schematic diagram of a conventional organic light emitting ^ splay ® board. The panel i includes a data drive iq, a scan drive port 12, and an array 丨4. The data driver 丨〇 controls the complex data lines Μ1 to , and the scan driver 11 12 controls the complex scan lines Sid SL·. The display array 14 疋, the phase f is interleaved, the data, the lines D11 to Dln, and the scan line Sh are formed, and each of the interleaved data lines and the scan lines form a display unit, for example, the data line 〇1! and the scan line S11 The display unit 1 is formed. As shown in the figure, the equivalent circuit of the display unit 100 (other display unit (4)) includes a switching transistor T10, a storage capacitor Cs, a driving transistor T11, and an organic light emitting diode, wherein the driving transistor ΤΙ 1 is a PMOS battery. Crystal. The scan driver 12 sequentially sends the scan signal to the scan line Sh to turn on only the switch transistors of all the display units in one column between the same #, and turns off the switch transistors of all the display units on the other columns. The data driver W is based on the image data to be displayed, and sends a pair of poor signal (for example, gray scale value) to the display unit of the column via the data line D]. For example, when the scan driver W2 reaches the scan signal to the scan line, it is displayed that the off transistor is turned on, and the data driver 12 transmits the pair = poor signal to the display unit _ through the data line di], and Storage capacitors (five) to store the ^ section of the electricity. The driving transistor T11 drives the organic light-emitting diode D1 according to the voltage of 0632-A50419-TWf 5 ^ 1302281 stored in the storage capacitor (3) to provide the driving current Id1. Since the organic light emitting diode is a current_element, the value of the driving current Id1 determines the brightness of the light emitted by the organic light emitting diode D1. Specifically, the current Id1 is the drain current of the driving transistor T11, that is, the driving ability of the driving transistor (1), which can be expressed by the following formula: idl 2k(vsgl + vthl)2, where 'milk represents the driving current Idl The value of moxibustion indicates the conductive parameter of the driving transistor T11, V indicates the value of the source of the driving transistor T11 - the gate voltage Vsg, and V / A1 indicates the threshold voltage of the driving transistor ΤΙ 1. In a conventional organic light emitting display device, the voltages Vddl and Vss1 of each display unit are coupled together and provided by an external power supply system. Wherein, the voltage Vddl is used to determine the value of the source-gate voltage Vsg of the driving transistor of the display unit, and the voltage Vssl is used to keep the driving transistor Tu in the saturation region, so the voltage Vssl needs to satisfy Vds< The condition of Vgs-vthl. However, since the organic light emitting diode M is further disposed between the voltage Vss1 terminal and the driving transistor T11, the display unit 100 is taken as an example, and the gate voltage Vd of the driving transistor T11 needs to satisfy the following condition: Vd=Voled+Vssl, Where v〇ied is the turn-on voltage of the organic light-emitting diode D1. Since the on-voltage value of the organic light-emitting diode increases with the use time, in the conventional organic light-emitting display device design, the voltage Vssl value provided by the external power supply system considers the rise and fall of the on-state voltage of the organic light-emitting diode. The value, that is, the voltage Vssl = Vd - Voled - (the on-voltage drift value of D1), so that the gate voltage Vd of the driving transistor T11 satisfies Vds < Vgs - Vthl. However, the turn-on voltage rise of the organic light-emitting diode does not occur until a certain period of time, and the turn-on voltage drift of the preferred organic light-emitting diode is not obvious. Therefore, the fixed supply of a large voltage V s s 1 will result in wasted overall power loss, especially in products smaller than 0632-A50419-TWf 6 -1302281. This power consumption cannot be ignored. SUMMARY OF THE INVENTION In view of the above, the present invention provides a display unit, a driving transistor, and a voltage source system. Such a light-emitting diode ^, , % pole and - cathode. The driving transistor has a source called a pole and a 'source receiving the first power, and the pole is switched to a second electric dance via the light emitting diode, I:: receiving the second voltage. The voltage source system is coupled to the drain of the drive transistor, and U is supplied with a second voltage according to the drain voltage of the drive transistor. An additional array display, including multiple data lines, complex and voltage source systems. Each data line is parallel to each other, and each scan is known. Each display unit corresponds to a transfer line and a Wei line, a county-display single-two-diode, a drive transistor, and an electric (four) system. It emits light and has an anode and a cathode. The driving transistor has a source, - no: the pole receives the _ „, the position is via the illuminating dipole = the third power plant is received. The factory _ = 纽 according to the driving circuit of the transistor, providing the second « , the heart μ-type display panel, including the composite material line, the complex sweep, the data driver, the scan driver and the Wei Xian are parallel to each other, and each _ scan line is parallel to each other == 2 a lean line, Used to rotate the data signal to the data lines. The driver's data is output to the sweeping cat line. Each - display, 〆 (4) field line, with line, and each - display unit includes - light two Polar body, _ drive electric r 』 line and data = light: Γ has an anode and a cathode., _ crystal has two closed poles, the source receives the first - dragon, the bungee is light and polar through the light-emitting diode Sanlong °1 (four) coffee to 彡, - 陶象则 - 2 according to = 0632-A50419-TWf 7 -1302281 " crystal > and extreme voltage 'provided the second voltage. In addition, the present invention provides a method of controlling the display unit The display unit has a light emitting diode and a driving transistor, and the method includes providing a voltage to the source of the driving transistor, providing a second voltage to the drain of the driving transistor via the light emitting diode, providing a third voltage to the gate of the driving transistor, and detecting the drain voltage of the driving transistor, And providing a second voltage to the light emitting diode according to the detected drain voltage. In order to make the above objects, features and advantages of the present invention more apparent, a preferred embodiment is described below The formula is described in detail below.

I [Embodiment] FIG. 2 is a schematic view showing a display unit according to the present invention. The display unit 200 includes a switching transistor T20, a storage capacitor Cs2, a driving transistor T21, an organic light emitting diode D2, and a voltage source system P2. The input end of the switching transistor T20 is coupled to the data line D2i, and the control end is coupled to the scan line S2i to receive a scan signal. One end of the storage capacitor Cs2 is coupled to the switching transistor T20, and the other end thereof is coupled to the reference voltage source Vref2. The driving transistor T21, such as a thin film transistor, has a gate handle connected to the storage capacitor Cs2 and the switching transistor T20, and receives a data signal voltage Vdata, the source of which is coupled to the voltage source Vdd2, and The drain is coupled to the anode of the organic light emitting diode D2. The cathode of the organic light emitting diode D2 is coupled to the voltage source Vss2. The voltage source system P2 is coupled to the drain of the driving transistor T21 and the cathode of the organic light emitting diode D2. Among them, the voltage Vss2 is lower than the voltage Vdd2. The voltage source system P2 can be a DC-DC converter, such as the model MAXI733/MAX1734, for supplying a voltage Vss2 according to the gate voltage Vd of the driving transistor T21. Figure 3 shows the voltage source system 0632-A50419-TWf 8 ^ 1302281 P2, wherein the transistor T21 is lightly connected to one end of a resistor, and the other end of the resistor ri is coupled to the FB terminal of the voltage source system P2. One end of the resistor R2, and the other end of the resistor R2 is grounded. V〇ut output of voltage source system p2

Then, it is connected to the cathode of the organic light-emitting diode D2 to supply a voltage vss2. Take the direct-to-straight-source power conversion converter MAX1733/MAX1734 as an example. The Vout terminal of the DC-to-DC power conversion has the following relationship with the FB terminal voltage: VsS2=Vd(Rl/R2 + l). Therefore, the values of the resistors R1 and R2 can be made to be rounded according to the design to provide the voltage Vss2 to the cathode of the organic light emitting diode according to the detected gate voltage Vd of the driving transistor T21, so that the driving power is made. The crystal T21 can be maintained in the saturation region even when the on-voltage of the organic light-emitting diode (10) rises, and the value of the voltage 仏2 can be adjusted according to the detected gate voltage Vd of the driving transistor T21. To avoid the waste of overall power. The present invention can be composed of an organic light-emitting display panel as shown in Fig. 2, and its structure is similar to that of Fig. 1, and will not be described herein. It is worth noting that in the no-panel, the circuit of Figure 2 can be used to measure only the buckling voltage of the driving transistor in the cell or the unit of the display unit to provide an external system to provide (4) Reference use of VSS. In addition, in the example of the second figure, the Ray B 〇彳 〇彳 电 电 日 日 Τ Τ Τ Τ Τ Τ Τ Τ Τ Τ Τ Τ Τ PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM PM , ° not), or components of the same or other equivalent circuits. In addition, as shown in FIG. 5, the present invention provides a method for controlling a display unit, and the display unit has a light-emitting diode and a driving transistor. The method includes: 0632-A50419-TWf 9 ^ 1302281 Providing a first voltage to the source of the driving transistor (S1), providing a second voltage to the drain of the driving transistor via the light emitting diode (S2), and providing a gate of the third electric house to the driving transistor (S3), detecting a drain voltage (S4) of the driving transistor, and adjusting a second voltage (S5) supplied to the LED according to the detected drain voltage. Wherein, the second voltage is provided to enable the driving transistor to operate in the saturation region.

After the end of step S5, the process returns to step S4 to detect the drain of the driving transistor again, to repeat step S5, and adjust according to the detected threshold of the driving transistor which may have changed. Providing a second voltage to the light emitting diode. The present invention has been disclosed in the above preferred embodiments, and is not intended to limit the scope of the present invention. It is to be understood that the present invention may be modified by the present invention without departing from the spirit and scope of the invention. The scope of protection shall be subject to the definition of the patent attached to May.

0632-A50419-TWf 10 4302281 [Simple description of the drawing], Fig. 1 is a schematic view of a conventional organic light emitting display panel. ♦ A schematic diagram of a display unit in accordance with an embodiment of the invention. Figure 3 is a circuit diagram of the voltage source system of Figure 2. Figure 4 is a diagram showing a display unit according to another embodiment of the present invention. Figure 5 is a diagram showing a control display list according to an embodiment of the present invention. Where the method flow [main component symbol description] 1 ~ panel; ~ data driver; 12 ~ scan driver; 14 ~ display array; 100 ~ display unit; φ Csl ~ storage capacitor; D1 ~ organic light-emitting diode; Ι) 1ι ···Ι)1η~ data line; ~ scan line; Ding 10~ switch transistor; T11~ drive transistor;

Vrefl, Vddl, Vssl~ voltage source; 2 0 0~ display unit;

Cs2~ storage capacitor; 0632-A50419-TWf 11 ^ 1302281 D2~ organic light-emitting diode; D2r"D2n~ data line; SC2~ current source, S2l···S2m~ scan line; T20~switch transistor; T21~ Driving the transistor,

Vref2, Vdd2, Vss2~ voltage source; P2~ voltage source system;

Rl, R2 ~ resistance; S1 ... S5 ~ steps.

12 0632-A50419-TWf

Claims (1)

13〇2281 X. Patent application scope: 1 · A display unit, including ··
Receiving a third voltage; a third voltage; and receiving a second arm, the source is connected to a voltage, the gate is coupled to the drain of the driving transistor according to the voltage source system, driving the transistor The drain voltage provides the second voltage. 2. The display unit of claim i, wherein the display unit further comprises: a switching transistor, comprising: receiving a gate of a scanning signal, receiving a first electrode of a data, and a second electrode coupled to the gate of the driving transistor; and a storage capacitor coupled between the second electrode of the switching transistor and a reference voltage; wherein the switching transistor system is configured according to the scanning signal Turning on, and when the switch transistor is turned on, storing the voltage of the data signal in the storage capacitor to generate the third voltage. 3. The display unit of claim 1, wherein the driving transistor is a PMOS transistor. 0632-A50419-TWf 13 • 1302281 Factory / · If the patent application _ the display unit described in item 3, the basin I am now (four) mvDD), n Shichang early Fan /, Zhong, Haidi 1 commotion _ ^ ~ The voltage is the negative voltage (D and lower than the first package, the anode of the light-emitting diode / the younger ^. 妾 to the bottom of the Hai-drive transistor, and the first diode reading (four) second „. Hai 5_ as requested in the patent scope i is from the < Master is not early, which drives the Lei Riji as an NM0S transistor. 6. If the scope of application is 5th, It is not early, wherein the first electric charge is a negative voltage (Vss), and the voltage is a positive voltage (Vdd) and is higher than the first voltage, and the cathode of the light-emitting diode is connected to The display unit of the first aspect of the invention, wherein the anode of the light-emitting diode receives the second voltage. The display unit of claim 1, wherein the light-emitting diode is an organic light-emitting diode 8. As claimed in the first paragraph of the patent application, the "Ting XL", the member is not early, wherein the driving transistor is a film 9. The display unit described in the scope of the patent application, wherein the voltage source system is a DC-DC power converter (DC_DC Convener). 10. An array display comprising: a plurality of data lines, each A data line is parallel to each other; a plurality of scanning lines, each of which is parallel to each other; a plurality of display units, each of which displays an I branch. _ 4 is not earlier than a set of scan lines and data lines, and each display unit The method includes: 0632-A50419-TWf 14 ^ 1302281 a light emitting diode having an anode and a cathode; and a driving transistor having a source, a drain and a gate, the source is connected to receive a voltage, The bungee is coupled to the second voltage via the light emitting diode, the gate receiving the third voltage; and the voltage source system is coupled to the bottom of the at least one driving transistor for determining the drain voltage of the driving transistor The array display of claim 2, wherein each Φ display unit further comprises: • a switching transistor, including a “pole” Corresponding to a scan line and receiving a scan signal; a first electrode 'coupled to a corresponding data line and receives a data signal; and a second electrode 'coupled to the gate of the drive transistor; and a storage capacitor, The second electrode of the switch transistor is coupled between a reference voltage and a reference voltage; wherein: the switch transistor system is turned on according to the scan signal, and when the switch transistor is turned on, the voltage of the data signal is stored in The storage capacitor is used to generate the third voltage. The array display of claim 10, wherein the driving transistor is a PMOS transistor. 13. The array display of claim 1, wherein the first voltage is a positive voltage (Vdd), the second voltage is a negative voltage (vss) and lower than the 0632-A50419-TWf 15 • 1302281 The anode of the light emitting diode is coupled to the drain of the driving transistor, and the cathode of the light emitting diode receives the second voltage. The array display of claim 10, wherein the driving transistor is a Lios transistor. The array display of claim 14, wherein the first voltage is a negative voltage (Vss), and the second voltage is a positive voltage (v - and higher than a first voltage, the light emitting diode) The anode of the driving transistor is coupled to the anode of the driving transistor and the anode of the LED is received by the anode of the LED. The array display according to the first aspect of the invention, wherein the light emitting diode An array display according to claim 1, wherein the driving transistor is a thin film transistor. 18. The array display according to claim 丨〇 Wherein the voltage source system is a DC-DC converter (DC-DC C〇nverte; r). 19. A display panel comprising: a plurality of data lines, each data line being parallel to each other; a plurality of scan lines, Each scan line is parallel to each other; a data driver for the data line to output data signals to the data lines; - a scan driver, _ connected to the scan lines for the rotation - the broom signal To 5 hai知瞒线; 0632-A50419-TWf 16 * 1302281 The complex display unit, each display unit corresponds to a set of scan lines and data lines, and each display unit comprises: - a light-emitting diode having an anode and a cathode And a driving transistor having a source, a drain, and a gate, wherein the source is connected to a dead voltage, the drain is coupled to the second voltage via the light emitting diode, and the gate receives the first And a voltage source system coupled to the drain of the at least one driving transistor for providing the second voltage according to the drain voltage of the driving transistor. 汝 Declaring the display of the patent range 1 g The panel, wherein each of the display units further comprises: a switch transistor, comprising: a gate coupled to a corresponding scan line and receiving the scan signal; a first electrode coupled to a corresponding data line and receiving the data And a second electrode coupled to the gate of the driving transistor; and a storage capacitor coupled between the second electrode of the switching transistor and a reference voltage; wherein the switching transistor According to the scan signal, when the switch transistor is turned on, the voltage of the data signal is stored in the storage capacitor to generate the third voltage. 21. The display panel according to claim 19, Wherein the driving transistor is a PMOS transistor. 0632-A50419-TWf 17 * 1302281 22. The display panel of claim 21, wherein the first voltage is a positive voltage (five), and the second voltage is The negative electrode voltage (Vss) is lower than the first electrode of the light-emitting diode to the driving transistor and the cathode, and the cathode of the light-emitting diode receives the second voltage. 23. The display panel of claim 19, wherein the driving transistor is an NM0S transistor. [24] The display panel of claim 23, wherein the first voltage is a negative voltage (Vss), and the second voltage is a positive voltage (V(10)) and is higher than the first light emitting diode. The cathode is connected to the & pole of the driving transistor, and the anode of the LED receives the second voltage. The display panel of claim 19, wherein the light emitting diode is an organic light emitting diode. The display panel of claim 19, wherein the driving transistor is a thin film transistor. The display panel of claim 19, wherein the voltage source system is a DC-to-DC power converter (dc_dc. 28. A method of controlling a display unit, the display unit has a light-emitting a diode and a driving transistor, the method comprising: providing a first voltage to a source of the driving transistor; T providing a second voltage from the LED to a pole of the driving transistor; providing a third voltage To the gate of the driving transistor; 0632-A50419-TWf 18 * 1302281 detecting the drain voltage of the driving transistor; and providing a voltage to the illuminating according to the detected threshold voltage A method of controlling a display unit according to the above-mentioned claim, wherein the second f-pressure system is provided such that the driving electric day and body are operated in a saturation region.
0632-A50419-TWf 19
TW94116739A 2005-05-23 2005-05-23 Display unit, display array, display panel and display unit control method TWI302281B (en)

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TW94116739A TWI302281B (en) 2005-05-23 2005-05-23 Display unit, display array, display panel and display unit control method
US11/247,414 US7619594B2 (en) 2005-05-23 2005-10-11 Display unit, array display and display panel utilizing the same and control method thereof

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